kind of a cool way to change CSS

Morell, Camille · Morell, Camille · commit d42c5a1b80af · 2016-12-20T16:03:09.000-06:00
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
@@ -21,7 +21,20 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
 
   <style>
+      :root {
+        --base: red;
+        --spacing: 10px;
+        --blur :10px;
+      }
 
+    img {
+      padding: var(--spacing);
+      background: var(--base);
+      filter: blur(var(--blur));
+    }  
+
+    .hl {
+      color: var(--base);    }
     /*
       misc styles, nothing to do with CSS variables
     */
@@ -48,6 +61,16 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    const inputs = document.querySelectorAll('.controls input');
+
+    function handleUpdate(){
+      const suffix = this.dataset.sizing || '';
+      document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix)
+    }
+
+    inputs.forEach(input => input.addEventListener('change', handleUpdate));
+    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
+
   </script>
 
 </body>
